Ok, I bought some "Thermo Lean" Thermos' before I started Atkins LC diet. Can I still take these on the diet.??

I'm finding my endurance is severly lacking during workouts. Prior to Atkins I could lift weights for many sets with no Fatigue. Now Under Induction with Atkins I find my endurance severely lacking, what am I doing wrong, or what can I take to solve it without boosting Carbs. I also take about 3 Centrum's per day.

any suggestions